I use it to remap midi drum tracks to different drum maps, saving the result to a new midi file.
Usage: midimapper.exe [OPTIONS] <INPUT_FILEPATH> <OUTPUT_FILEPATH>
Arguments:
<INPUT_FILEPATH> Input midi file
<OUTPUT_FILEPATH> output path
Options:
-i, --input-map-path <INPUT_MAP_PATH> Input midi map // TODO: default to GM
-o, --output-map-path <OUTPUT_MAP_PATH> Output midi map
-n, --track-number <TRACK_NUMBER> Channel name to convert Channel number to convert
-h, --help Print help